This paper presents a numerical investigation of two Hilbert transform (HT)-based nonlinear identification methods to estimate dynamic characteristics of ship roll motions using free-roll response. Since the methods are nonparametric, they can avoid the identification error caused by false model assumption. Then, these methods are extended to identify roll motion from random ship response in irregular waves. A novel two-step identification scheme is proposed by combining the random decrement technique and the HT-based identification methods. Results of numerical studies show that the two methods are effective for roll motion identification using free-roll response. More precise results for the nonlinear coefficients can be obtained when multiple harmonics were considered. Four wave exciting conditions with different significant heights and peak periods were simulated to investigate the proposed two-step scheme. The results indicate that the nonlinear dynamic characteristics of roll motions can be successfully identified from random ship vibration under resonant conditions.
Hilbert transform-based nonparametric identification of nonlinear ship roll motion under free-roll and irregular wave exciting conditions
Ships and Offshore Structures ; 17 , 9 ; 1947-1963
2022-09-02
17 pages
Article (Journal)
Electronic Resource
Unknown
Parametric identification of nonlinear ship roll motion from forced roll data
Tema Archive | 1988
|Roll-on-roll-off ship drainage device and roll-on-roll-off ship
European Patent Office | 2024
|A disturbance accommodating controller for roll motion of a ship in irregular seaways
Tema Archive | 2002
|A stability analysis of the roll motion of a ship in an irregular seaway
IOS Press | 1975
|